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徐州出臺小麥春季管理技術(shù)意見

2023-02-09 10:09:23 來源：江蘇省徐州市農(nóng)機推廣站 閱讀量：18927 評論

導(dǎo)讀：當前立春已過，要迅速從過節(jié)氛圍轉(zhuǎn)向春季田管落實和春耕備耕準備，采取有效措施促弱轉(zhuǎn)壯，恢復(fù)生長，夯實夏熟豐收基礎(chǔ)。

　　【農(nóng)機網(wǎng) 地方農(nóng)機】去年秋播以來積溫較高、光照較足，有利于適期小麥生長，總體長勢較好。12月中下旬降溫明顯且持續(xù)時間長，雖抑制了部分早播小麥旺長，但對晚播小麥的苗情轉(zhuǎn)化不利，小麥苗情不平衡性較大。當前立春已過，要迅速從過節(jié)氛圍轉(zhuǎn)向春季田管落實和春耕備耕準備，采取有效措施促弱轉(zhuǎn)壯，恢復(fù)生長，夯實夏熟豐收基礎(chǔ)。
 
　　主要表現(xiàn)在：一是小麥群個體總體正常。二是苗情不平衡。徐州全市有旺長趨勢小麥面積約19.5萬畝，主要集中在旱茬早播田塊，莖蘗數(shù)偏多，給后期精準施肥帶來了一定難度，倒伏、病害發(fā)生風(fēng)險較大；三類苗面積約66.4萬畝，多為晚播弱苗小苗，干物質(zhì)積累少，幼穗分化遲，實現(xiàn)足穗、壯稈和大穗難度大。三是凍害隱患較大。全市目前受輕度受凍面積22.1萬畝，近期冷空氣活動較頻繁，春季氣候多變風(fēng)險大，倒春寒、濕漬害，及低溫寒潮和凍害植傷勢必增加晚播小麥苗情轉(zhuǎn)化的難度。
 
　　根據(jù)當前苗情特點，早春管理要重點抓好以下四個方面：
 
　　1、適當控旺促弱，促平衡生長。對長勢偏旺、莖蘗數(shù)偏多的旺長小麥，要在拔節(jié)前進行適度鎮(zhèn)壓或適當化控，控旺促壯防倒。對遲播弱小、群體偏少、預(yù)期穗數(shù)可能不足，或者前期施肥不足、有脫力落黃現(xiàn)象的麥田，可在返青期追施接力(返青)肥，畝施10～15公斤三元高效復(fù)合肥(N、P2O5、K2O各15%)。對秸稈還田量大、苗情過弱的可每畝再加施5公斤尿素，盡早促弱轉(zhuǎn)壯，爭穗爭粒，促進苗情轉(zhuǎn)化升級。對于生長正常的一、二類苗麥田，小麥越冬期及返青期不宜追施化學(xué)肥料。
 
　　2、適時化除，防凍藥害。對前期化除效果差，目前草害達防治指標田塊，要根據(jù)草相特點在拔節(jié)之前及早選準藥劑、用好藥量進行化學(xué)除草，控制雜草危害。早春莖葉處理，要在2月中下旬至3月上中旬，小麥拔節(jié)前(拔節(jié)后化除不安全，易導(dǎo)致藥害)進行。以禾本科雜草為主的麥田，可選用唑啉草酯·炔草酸、精惡唑禾草靈等藥劑進行防除；以闊葉雜草為主的麥田，可選用氯氟吡氧乙酸、2甲4氯等藥劑進行防除。禁止選用長殘留除草劑，以免造成后茬作物藥害。要密切關(guān)注天氣趨勢，注意避開低溫寒流，掌握在施藥前3～5天后5～7天日均氣溫不能低于5～8℃，防止出現(xiàn)凍藥害。
 
　　3、防御倒春寒，及早補救。小麥拔節(jié)后尤其是拔長兩節(jié)后，遇到氣溫0℃以下霜凍，主莖和大分蘗幼穗就會凍死凍傷。要密切關(guān)注天氣變化，低溫寒流來臨前對缺墑麥田及時灌水，可改善土壤墑情，調(diào)節(jié)近地層小氣候，緩沖地表溫度變幅，減輕凍害發(fā)生。在小麥凍害發(fā)生后2～3天要及時調(diào)查幼穗受凍程度，根據(jù)受凍程度迅速增施恢復(fù)肥。僅葉片凍害或主莖幼穗凍死率10%左右，不必施肥；莖蘗幼穗凍死率10%～30%的麥田應(yīng)迅速畝施尿素5公斤左右，每增加10個百分點，畝增施2.5公斤尿素；主莖幼穗凍死率80～100%時，最多畝增施15公斤尿素，爭取小分蘗和高節(jié)位分蘗成穗，才能減少產(chǎn)量損失、盡可能獲得正常產(chǎn)量。要注意增施的恢復(fù)肥跟正常施用的拔節(jié)孕穗肥互不抵消。
 
　　4、及時清溝理墑，防漬于未然。配套溝系是防治漬害，奪取小麥高產(chǎn)穩(wěn)產(chǎn)的重要保證。“麥田一套溝，從種管到收”。各地要抓住天氣晴朗，氣溫回溫有利時機，及早清溝理墑，確保排水通暢、雨止田干，切實防止冬春連陰雨天氣造成嚴重漬害。

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